foo.cpp: In function 'int main()':
foo.cpp:26:71: warning: operation on 'point' may be undefined [-Wsequence-point]
  while(scanf("%d%d%lf",&e[++point].from,&e[point].aim,&e[point].lon)==3)
                                                                       ^
foo.cpp:26:71: warning: operation on 'point' may be undefined [-Wsequence-point]
foo.cpp:46:4: error: 'nn' was not declared in this scope
    nn++;
    ^
foo.cpp:22:6: warning: unused variable 'a' [-Wunused-variable]
  int a,b;
      ^
foo.cpp:22:8: warning: unused variable 'b' [-Wunused-variable]
  int a,b;
        ^